The corrosion working group is on the one hand engaged in mechanism-based investigations and modeling of corrosion processes. On the other hand new coating systems are developed by using biogenic substances and chemical nanotechnology.
In the field of corrosion protection several actual projects are characterized by methods of chemical nanotechnology to be used for the synthesis or modification of coating systems. However, also for the generation of the coating matrix partly innovative methods like a metal treatment by ultrasound or plasma-electrolytic oxidation are being used. Furthermore biogenic substances are used for the development of protective coatings especially against biocorrosion.
In the second main field of work the focus is on corrosion investigations on new materials or for materials qualification for new technologies. The fundamental understanding of corrosion mechanisms should in some cases also lead to a modeling of corrosion processes. As new materials in the last years especially titanium alloys have been under investigation. For the time being this work is focusing especially on alloys for medical technologies like e.g. Ti-13Nb-13Zr. For this alloy besides the characterization of corrosion properties some work is also aiming at optimized implants by combining a partial heat treatment of the alloy with a localized surface treatment by plasma anodizing incorporating hydroxyapatite into the oxide layer.
Concerning alloy qualification for new technologies locally resolved corrosion measurements on compounds being friction stir welded under ultrasonic support will help for the future development of this new joining technology.
More mechanistic investigations are being done concerning dew point corrosion of aluminium heat exchangers. The aim is here to build the basis for corrosion modeling and thus for the modeling of heat exchanger failures. This should allow the supplier to optimize construction and working modes.
Furthermore the group is responsible for corrosion investigations, materials selection tasks and damage analysis in the frame of industrial research.
- stationary current-potential curves
- impedance spectroscopy
- rotating disc and ring-disc electrodes
- cyclic voltammetry
- electrochemical noise analysis
- scanning electron microscopy with EDX-analysis
- electron beam microanalysis
- atomic absorption spectroscopy
- ion chromatography
- gas chromatography coupled with mass spectrometry GC-MS
- contact angle measurement
- adhesion testing
- particle size analysis and zetapotential measurement